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How to use Subcarrier reset mode(0x44[2:1]=01b) on ADV7320

Hello.

When we want to use "Subcarrier reset mode(0x44[2:1]=01b)" on ADV7320, my understanding for using it are below.

-Set register 0x44[2:1] to 01b

-Apply reset signal to RTC_SCR_TR pin in Field 7 (PAL) or Field 3 (NTSC)

There is no problem in NTSC case, but in PAL case it can not lock to subcarrier in rare cases.

So, what should we do to get the stable SC-lock?

==additional information==

To set register 0x7C to 1 makes it work well even PAL case.

But in that case we can see the noise on first line in field 1 unfortunately.

Your help would be most appreciated.

Best regards.

Kikka

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